论文部分内容阅读
承受外载的旋转机械靠摩擦传递扭矩时,主轴属于三维材料非线性与边界非线性的耦合问题——弹塑性接触问题。本文采用有限元增量法对此进行了详细分析,导出了基于流动理论的塑性增量的本构方程及等强化材料在复杂应力状态下的Mises模型的本构矩阵。在有限元计算中采用了精度较高的一阶自校正法,在接触问题分析中设定了自由、粘连、滑动三种边界,并采用了接触单元处理,求解时采用凝缩矩阵法及有限元混合法。对摩擦传递扭矩的水轮机主轴计算结果进行了分析,并与三维光弹实验结果进行了比较,两者是一致的。
Bear the load of rotating machinery by friction transmission torque, the spindle belongs to the three-dimensional material nonlinear and boundary nonlinear coupling problem - elastoplastic contact problem. In this paper, the finite element method is used to analyze this in detail. The constitutive equations of plastic increment based on the flow theory and the constitutive matrix of the Mises model of the isotropic material under complex stress state are derived. In the finite element calculation, the first-order self-tuning method with higher accuracy is adopted. In the analysis of contact problem, three kinds of boundaries of free, blocking and sliding are set, and the contact element processing is adopted. The condensing matrix method and finite Yuan mixed method. The results of frictional torque transfer of turbine main shaft are analyzed and compared with the results of 3D photoelastic experiment, the two are consistent.